wire crimping defects，wire crimping defects，wire crimping defects，wire crimping defects，Safety on board"It used to be (that getting) into a cockpit on an American aircraft that was flying in American airspace was as easy as the doors you use to get into the (toilet)," O'Keefe recalled.Bulletproof and locked cockpits became standard on commercial passenger aircraft within two years of 9/11.The Arming Pilots Against Terrorism Act was signed into law in November 2002, and by the following April, the first weapon-carrying pilots were on board US commercial flights.While aviation fans and children could once hope to get a visit to the flight deck, that dream swiftly came to an end.Private jet pilot and social media star Raymon Cohen told CNN Travel in July that he believes the unprecedented inaccessibility added to flying's mystique."People are not welcome in the cockpit anymore, so it's like a big secret," Cohen said. "Now this (following pilots on Instagram) is one of the only ways people can see what's happening."The immediate impact of 9/11 included a big drop in travel demand. Not only had passenger confidence taken a hit, but the additional security meant the flying experience was no longer fast and hassle-free.In 2006, the International Air Transport Association (IATA) estimated that airline revenues from domestic US flights fell by $10 billion a year between 2001 and 2006. For comparison, the net losses globally due to the Covid pandemic in 2020 were $126.4 billion in total, according to the IATA.In a study from 2005 on the impact of 9/11 on road fatalities, Cornell University's Garrick Blalock, Vrinda Kadiyali and Daniel H. Simon found an increase in travelers choosing to drive rather than fly. The unintended consequence of this was that "driving fatalities increased significantly following the terrorist attacks of September 11, 2001." They estimated that a total of 1,200 additional driving deaths in the past five years were attributable to the effect of 9/11.Speaking to CNN ahead of the 20th anniversary of 9/11, Kadiyali said, "There's been the fall of Kabul and and all these recent events in Afghanistan (...) It did cross my mind whether people would start getting nervous about flying again."Delays, long lines and confusion over restrictions are also all back on the agenda in the pandemic era.As to whether something like 9/11 could happen again, O'Keefe reflected upon the fact that the greatest achievements of Homeland Security, and of security services around the world, can never be shared with the general public."In the process of educating the public, what you also do is educate the terrorists," so we will never know of all the near-misses, he said. "You almost get into a false sense of security."That September morning in 2001 "flipped the switch right away from almost non-existent security to unbelievable, in-your-face, all the time."However, two decades later, there have been no aviation-based terrorist attacks anywhere near the scale of 9/11. Said O'Keefe, "These security measures have worked."